Large Eddy Simulation of Liquid-Jet Primary Breakup in Air Crossflow
Large Eddy Simulation of Liquid-Jet Primary Breakup in Air Crossflow
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DOI：
10.2514/1.j052509
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发表时间：
2013-12
期刊：
影响因子：
2.5
通讯作者：
F. Xiao;M. Dianat;J. McGuirk
中科院分区：
文献类型：
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作者：
F. Xiao;M. Dianat;J. McGuirk
采用稳健的两相流大涡模拟方法，模拟了常压下空气横流中轴对称液体射流的一次破碎过程。采用水平集与流体体积相结合的方法实现了界面的精确跟踪。为了处理高液气密度比的情况，建立了外推的液体速度场，并用于界面附近的动量方程离散化。基于局部水平集值，假设流体密度和粘度在界面上急剧跳跃。通过模拟液体射流在非湍流气体横流中的非湍流入流，在液体射流上游侧的大涡模拟预报中观察到规则的表面波，其波长与实验测量符合得很好。预测的波长随着气体韦伯数的增加而减小，这意味着表面波是由瑞利-泰勒型不稳定性引起的。模拟的速度。
A robust two-phase-flow large-eddy-simulation methodology is applied to simulate the primary breakup of an axisymmetric liquid jet injected into an air crossflow at atmospheric pressure. The coupled level-set and volume-of-fluid method is implemented for accurate interface tracking. To deal with high liquid/gas density ratio, an extrapolated liquid-velocity field is created and used for momentum-equation discretization in the vicinity of the interface. Based on the local level-set value, sharp jumps in fluid density and viscosity are assumed across the interface. By simulating the nonturbulent inflow of a liquid jet into a nonturbulent gaseous crossflow, regular surface waves are observed in the large-eddy-simulation predictions on the upstream side of the liquid jet, with the wavelength agreeing well with experimental measurements. The predicted wavelength decreases as the gaseous Weber number increases, implying that the surface waves arise from a Rayleigh–Taylor-type instability. The simulated velocity...